Dry stencil



June 3, 1930.A H. GORDENSTEIN DRY STENC IL Orginl Filed Dec. 8, 192B W4/7 JNVENTOR. y BY 6"@ ATTRNEY y Patented June 3, 1930 UNITED STATES I`HARRYGORDENSTEIN, OF SPRINGFIELD, MASSACHUSETTS DRY STENCIL Application led December 8, 1928, Serial No. 324,605. Renewed February 13, 1930.

This application relates` lto improvements in stencils and is directed more particularly to those known as dry-stencils such as are used in connection with mimeographing ma- 6 chines and the like.

In'order to facilitate a clear understanding of the novel features of the present invention brief reference to present day Astencils and their use will be made.

The stencils of the type to which the invention relates consistfessentially of an especially prepared stencil sheet and back which are secured together at their upper ends. `The stencil overlies the back and in cutting the stencil or providing it with matter to be re-lA produced on the mimeograph machine the back serves to provide a support or to back up the stencil sheet. This is especially true when for instance 4the stencil is cut on a typewriter as the back lies against the platen thereof.

The back is provided with eyelets or openings adjacent the upper end thereof and is perforated adjacent said end so that the main body of the back may be separated from this end portion. After the stencil cutting operation the stencil is wrapped around the rotatable drum of a stencil machine and the `eyelets of the back are slipped over suitable pins or studs rovided on the drum for holding on'e end o the\stencil sheet in place. The other end of the stencil is then properly clamped to the drum. With the stencil applied to the drum the back istorn from the end portion thereof which servesv to hold one end of the stencil in place.

In connection with the stencil thus briefly described there are objections and disadvantages which I shall now refer to in order to distinguish the novelty of my invention thereover.

The stencilsheet to which is applied certain chemicals or whichis prepare by some mechanical or chemical treatment is readily effected by atmospheric conditions such as moisture so that certain chemicalsor other materials applied thereto are taken up bythe back. At least the stencil sheet tends to deposit on the back, with which it is 1n contact, some of the ingredients of which it is vcom- 50 posed so that the sheets are not only likely to stick togetherbut at the same time Ithe back is stained or discolored. Also there is a tendency for the stencil sheet to become displaced on thedrum due to the eyelets of the strip giving away or the stencil-sheet tearing away from the end strip of the back.

I aim to overcome these objections and disadvantages according to my'invention by the provision ofthe novel combination and arrangement now to be described with reference 6o to the accompanying drawings in which-'- Fig. l .is a plan view of a stencil of my-invent-ion with parts broken away for clearness.

Fig. 2 is a sectional elevational view taken 65 on the line 2-2-of Fig. l, and l Fig. 3 is a plan view of the stencil as it appears when ready .for applying to the drum of a mimeographing machine. v

.Referring yto the drawings the invention 70 will now be described in detail.

2 represents a back which may be of paper or some other suitable flexible material which hasits upper edge doubled back upon itself as shown to provide a reinforced edge. R. Eyelets E are provided in the upper edge of the back and are disposed so that the e elets are reinforced by the doubled back portion of the sheet whereby the studs or pins of a mimeographing drum will not break through the eyelet openings.

The back 2 is perforated along a line represented at 4 so that a body portion B1 may be separated from a strip portion B'which may -be called a binding'strip. A stencil/sheet S isv 85 provided which is of the usual stencil paper well known in the art and has its upper end secured to the vbinding by an adhesive material of some sort at a point indicated at 6.

Between the stencil S and body B1 of the. 90

back there is disposed a protective sheet 10. This sheet may consist of waxed paper or ythe like which may function to prevent the back and stencil from sticking together Vand yto prevent the back being discolored by the in- 9.5-

gredients of the stencil. vSaid sheet 10 is perforated at 8 as shown so that -the main body thereof may be separated from a protective strip P which will be left on the binde ing strip B portion of the back. The perforations 8 are disposed so that the edge' of the protective strip 4P extends beyond the Iinner edge of the binding strip -B as shown.

With the different sheets in their superposed relation, that is, with the protective sheet between the stencil sheet and back the said back is not only protected, by any tendency of the stencil and b ack to stick together is obviated. In this way the assembled sheets may be stored for long periods yof time as theyl are not likely to be rinjured by atmospheric conditions. l

In use the protective sheet 10 is first removed by tearing on the erforations and then the stencil Sis marke or cut by means of a typewriter or otherwise, the portion B1 of the back'serving as a support for the sheet during the marking operation.

When the stencil has been marked it is ready to be placed about the drum of a mimeographing machine. This is accomplished by slipping the yeyelets E over the pins or studs of said drum' while the stencil is wrapped around the 'drum andi its other end anchored in the usual way. Any pulling strains which would ordinarily cause the eye-y lets to tear out are now met with the rein-- forcement so that in this respect the stencil of. the invention isy more serviceable than those of the prior art.

As a further feature it will be noted that the portionP of the protective sheetcarried by the strip and which overlies the inner edge of the bonding strip B is useful in retecting the stencil sheet and in effect rein orces said-- sheet against rupture which might be caused by the rotation of the drum or the forcing of ink therethrough.

The invention may be practiced in various ways b changes and modifications and I do notwis to be limited b the specific form of theinventionshowny an described but rather if at all b the appended claims.

What claim is: 1. A stencil of the class described comprising i`n combination, a back sheet of pa er having its upper end doubled upon itsel to provide a reinforced end portion and pro- `vided with-a line of perforations and a plurality of eyelets, the said perforations being disposed at a distance from said reinforced end ortion and the said eyelets being disposed in said reinforced portion, a protective sheet of paper overlying said back havin its upper end secured thereto a'djacent sai perforations and being provided with a line of perforations thereacross disposed towards the main body of the sheet and away from the perforationsof the back sheet and a stencil sheet overlying said protective sheet having its upper end secured to said back sheet between the upper lend of the protective sheet and the eyelets of said body sheet.

2. A' stencil of the class described. comprising in combination, a back-sheet proand a stencil overlying said protecting sheet,

both of which have their upper edges secured `to'the strip portion of said back sheet, the said protective sheet being'provided with lperforations extending thereacross adjacent the upper edge t ereof to provide a main body portion whic is separable from a stri portion secured to the strip portion of the bac lsheet and 'the said perforations being disposed away rom the perforations in the back sheet and towards the main body thereof whereby when the main body portions of the back sheet and protective sheets have been separated from their respective strip portions the strip portion of the protective sheet will be disposed between the inner edge'of the strip portion ofthe back sheet and the stencil.

3. A stencil of the class described comprising in combination, a back sheet provided with perforations extending thereacross adjacent its upper end to rovide separable main body and strip portions, a protecting sheet overlying said back sheet and a stencil overlying said protecting sheet, both of which have their upper edges secured to the strip portion of said back sheet, the said protective sheet being provided with perforations extending there across adjacent the upper edge thereof .to rovide a main body portion which is separable from a strip portion secured tothe strip portion of the back sheet and the said perforations being disposed away from the perforations in the back sheet and towards the main body thereof whereby when the main body portions of the back sheet and protective sheets have been separated from their respective strip portions the strip portion of the protective sheet will be disposed between the strip portion of the back sheet and the stencil.

HARRY GORDENSTEIN. 

